What is the difference between speed, velocity, and instantaneous velocity? Give examples of each
What will be an ideal response?
Answer: All describe motion, speed being the simplest. Speed is a ratio of distance traveled per unit of time. A car driving along a road, for example, may have a speed of 30 km/h. Velocity is speed but with direction stated or implied, and is therefore a vector quantity. The same car driving due north along a road has a velocity of 30 km/h north. Instantaneous velocity is the velocity at any instant. Its magnitude is shown by the reading on a speedometer. If you get a traffic ticket for speeding, it is your instantaneous velocity, not an overall average velocity, that may get you in trouble.
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What is the fate of an isolated brown dwarf?
A) It will become a black hole. B) It will become a white dwarf. C) It will slowly evaporate to nothing. D) It will become a neutron star. E) It will remain a brown dwarf forever.
How much heat (in kcal) must be removed to make ice at ?10°C from 2 kg of water at 20°C? (The specific heat of ice is 0.50 cal/g/°C.)
a. 190 b. 200 c. 240 d. 210 e. 50
Two isotopes of the same element differ only in the number of protons
Indicate whether the statement is true or false
Two loudspeakers placed 6.0 m apart are driven in phase by an audio oscillator whose frequency range is 2193 Hz to 2967 Hz
A point P is located 4.4 m from one loudspeaker and 3.6 m from the other. The speed of sound is 344 m/s. The frequency produced by the oscillator, for which constructive interference of sound occurs at point P, is closest to A) 2580 Hz. B) 2903 Hz. C) 2473 Hz. D) 2795 Hz. E) 2688 Hz.